A camouflaged Lexus sedan — most likely the next-generation IS — has been spotted in California (click for a larger image):

With camouflage identical to previouslydisguisedLexus prototypes, this mystery sedan is well hidden under its black vinyl wrap, but the general size and shape suggest the IS.

Beyond the wheels and the dual exhausts, the only other visible detail is the flash of an L-shaped LED taillight:

The final consideration is the timing of this prototype showing up in California — the last three models seen in similar camouflage were the GS, ES, & LS, and all were spotted within two months of their official reveal.

If this is indeed the new IS, there would be more than four months between now and its rumored January debut at the Detroit Auto Show — this could mean that the IS simply needs more time for pre-production testing, OR the plan is for an earlier reveal.

Let’s open it up — can you spot any other details in this mystery sedan photo?